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| AAR FB Journal Brasses, what were they used on? https://www.rypn.org/forums/viewtopic.php?f=1&t=48790 |
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| Author: | Jason Midyette [ Tue Jun 10, 2025 1:59 pm ] |
| Post subject: | AAR FB Journal Brasses, what were they used on? |
While I am quite familiar with the typical steeple back journal brasses, I had never encountered AAR FB journal brasses until I ended up with the ones now listed in the classifieds. Does anyone know what their use was? Does anyone still use equipment that uses them? Thanks Jason Midyette |
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| Author: | Adam Phillips [ Thu Jun 12, 2025 1:32 am ] |
| Post subject: | Re: AAR FB Journal Brasses, what were they used on? |
AAR MSRP D-48 covered the Flat Back bearings. It was revised as late as 1970. I don't have a copy to post. I doubt it would address specific applications, however. I think the steeple back and flat back bearings were subject of a study regarding collar breakage and resulted in the 1970 change in the standard. |
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| Author: | Jason Midyette [ Thu Jun 12, 2025 11:11 am ] |
| Post subject: | Re: AAR FB Journal Brasses, what were they used on? |
Thanks for the info. Am I correct in thinking that, with the proper wedge, the Flat Back bearings are interchangeable with the Steeple Back bearings? Are the Flat Back bearings of any use to anyone these days or are they just fancy scrap metal? Thanks Jason Midyette |
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| Author: | David Johnston [ Fri Jun 13, 2025 2:38 am ] |
| Post subject: | Re: AAR FB Journal Brasses, what were they used on? |
With the correct wedge the two bearing styles are interchangeable. The flat back brass was a superior design and was less likely to run hot. As I recall flat back brass were required in a stabilized box. A stabilized box got an extra six months on the repack date. |
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| Author: | Jason Midyette [ Sat Jun 14, 2025 6:54 pm ] |
| Post subject: | Re: AAR FB Journal Brasses, what were they used on? |
Sounds like they are the "Betamax" of Journal brasses. Guess they are bound for the scrap heap unless someone speaks up soon Jason Midyette |
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